Improvement in steam-generators



v XW@ OQOGGGO naaf/epm rRANcIs WILLIAM wenn, or BOLTON, ENGLAND.

Letters Patent No. 98,726, dated January/'11, 1870.

IMPRQVEMENT IN STEAM-GENERATORS.

'111e Schedule referred to in the-se Letters Patent and `making part of the same To all whom it 'may conce/rn: p

Be it known that I, FRANCIS WILLIAM WEBB, o Bolton. England, have invented certain new and useful Improvements in the Gonstructionof the Fire-Boxes and other Port-ions of Steam-Boilers and I do hereby declare that the following isa full and exact description of the same, reference being had to the accompanying drawings, forming a part of this specifiof the riveted joints, and the; greater elasticity of they box atrthe corners, which allows o f its free expansion and contraction.

VThe said invention also consists in constructing the p said iire-boX with a. separate tube-plate, which may be made thicker than the other portion of the box, and may be readily removed, if injured, and replaced by a new plate.

The said invention may be advantageously applied to the construction of fire-boxes of iron, but its irne port-ance is more clearly apparent in, the construction of steel {ire-boxes, wherein very thin plates are desirable, which plates cannot be. made properly secure by riveting. g f l l My improved fire-box may be made rectangular or circular, or of any other'desired form in its horizontal section, and the one joint or seam, where the two ends of the plate meet, may be secured in various ways.

The said invention further consists in the use of rivets ot' an oval, elliptical, or oblong cross-sectional form, for securing the longitudinal seams in steamboilers, whereby l am enabled to give to the boiler great shearing-strength at the seams, without greatly decreasing the-sectional area of the plates between the rivet-holes, while at the same `timethe elasticity of the joints is increased.

In the accompanying drawings I have illustrated the application of my invention to steam-boilers and fireboxes, and I wilhnow proceed more fully to describe the same.

.Description of the Drawings.

lFigure 2 is afyertical section, on the line a: x, fig.` 1. Figure 3 is a horizontal section, on the line y y, tig. 1.

Figure 4 is a front elevation of a similar tire-box,

otslightly modified construction, as4 hereinafter explained. 4

Figure 5 is a front elevation of a circular fire-box, constructed accordingto my invention.

Figure 6 is a vertical section, on the line x x.

Figure 7 is a horizontal section, on the liney y.

Figure 8 `illustrates the method of securing the tirebox tothe outer box creasing of the boiler.'

Figures 9and 10 are va front view and section, through a joint or seam of double riveting, showing the application thereto of my improved rivets.'

Figure 11 is a front view'of a seam of single riveting.

Figure 12 is a transverse section of my improved rivets.

Like letters indicate the same parts throughout the drawings.

The' single plate or sheet a, which forms the front,

sides,`and back of my improved tire-box, is curved or bent at the corners, (as shown in fig. 3,) by any con venient or suitable apparatus or machinery used in the working of metal plates, audits ends are united and v secured together at b. Y

In iig. 1, I have shown the joint or seam b, made byV `flanges formed 'on each end ofthe plate, the said flanges v being brought close together, and Vsecured by rivets passed through them; V

In iig. 4,'tl1e plate is secured by a but-joint,tl1e

edges being brought fairly together and riveted to the y strip or bar c, in a manner well understood by boilermakers, and others skilled in the working of metal plates. f

, In figs. 1 and 2, I have shown the tube-plate d, secured inV its place.

In figs. 5, 6, and 7,= I have shown the fire-box, with the'tube-plate removed.

It will be seen, by reference to these figures, that the plate a is flanged at a', for the reception of thev tube-plate, which is also formed with a corresponding flange, d', the two anges being fitted and riveted together, as shown.

It is obvious, that, if desired, my improved lire-box 'arranged within the water-space between the two plates, as shown in iig. 8, These ferrules form stays, which keep the plates a and f at the proper distance apart, and at the same time, by means of the nuts g', the said plates 4may be screwed tightly up to the fer# rules g. By the use 'of these bolts, nuts, and ferrules,

I avoid tapping the plates a and f, and am therefore enabled to use thinner plates than could otherwisebe employed, and the removal of the said stays and the iire-box, tor cleaning, or other purposes, is also greatly facilitated.' f

By referring to gs. 9, 10, and 11, which illustrate the application of my improved rivets to the seams of It will also be obvious, that by using rivets of the y form shown in fig. 12, or a substantially similar form, the holes for such rivets are formed without diminishj' ing the area of the plates i between the rivet-holes, to

the extent to which itis diminished in using ordinary circula-r rivets consequently the joint or seam is rendered stron ger,.and its elasticity is increased by the better distribution of the diminished sectional area.

What I claim as my invention, and desire to secure by Letters Patent, is

and back constructed of a single plate or sheet of metal, substantially as set forth.v v

2. Constructing the said fire-box with a separate tube-plate, substantially as and for thepurposes4 set forth.

3.x Securing the `joints or seams of steam-boilers with oval, elliptical, or oblong rivets, inserted through holes of corresponding form, and arranged to oi'er the greatest resistance to the shearing-strain caused by the pressure within the boiler, substantially as setforth.

FRANCIS WILLIAM WEBB.4 [L. s]

Witnesses:

fC. DoNHoE,

I. S. HICKLING.

l. A tire-box for a steam-boiler, with itsirout, sides, 

